The event was captured on a viral video as part of an art exhibit created by artist Evan Pestaina located in an art space in Miami. It was organized by Miami Heat NBA star Dwyane Wade. Oliver, 17, was a team fan who wore Wade’s basketball jersey when he was buried last month.

Miami: if you’re out for ArtWalk tonight - stop by our 17 hour commerative exhibition honoring the 17 lives lost...going on today until midnight and tmr from 12-5pm. Time to pick up the phone and make some calls!! #NeverAgainpic.twitter.com/SuaPxIwFh4

The mural in Joaquin’s honor, painted by his dad featured an image of the student with the words: “We demand a change.” Joaquin’s classmate, Lex Michael, recorded the video that shows the emotional father swiping angrily with a brush as he creates his message.

Students from Marjory Stoneman Douglas High School signed the mural, and Oliver added the words: “Guac’s Dad: Love you forever.” Guac was Joaquin’s nickname.

In the wake of the Parkland shooting Oliver founded an organization called Change the Ref to empower youth to press for gun control and other issues.

Young people are not the light at the end of the tunnel, they are “lighting the tunnel right now,” Oliver says in a videotaped message about the organization. “We need to support them. They will choose the right refs [referees] for a fair game so we can have a great nation again.”

The “Parkland 17” weekend installation also included a phone booth where visitors could “Ring Your Rep” to let their legislators know how they feel about gun control, reported CBS Miami.

The weekend art exhibit was also held to promote the upcoming March 24 “March For Life” to demand gun control. The main rally will be in Washington, D.C., and hundreds of affiliate marches will be held throughout the U.S. and abroad.

By Sunday evening Lex’s video had been seen on social media nearly one million times in the U.S. and abroad, and people responded with emotional messages.

You can feel his pain and anger with every stroke. This is heartbreakingly powerful. #NeverAgain